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UV-vis-NIR absorption and PL spectra. (a) UV-vis-NIR absorption spectrum of four carbon-based nanomaterials. (b) PL spectrum of CQDs and GQDs excitated by 360 and 320 nm, respectively. Inset are photos of CQDs and GQDs solution under sunlight (the left two) and under dark (the right two) irradiated by a 365-nm UV beam.
